What is one side effect of a high fiber diet?

A high fiber diet can lead to increased gas production in the gastrointestinal tract. This occurs because fiber, particularly the soluble and fermentable types, is not fully digested in the stomach and upper intestine. When it reaches the colon, bacteria ferment it, producing gases such as hydrogen, carbon dioxide, and methane as byproducts. While fiber is an essential part of a healthy diet and provides various benefits, such as improving digestive health and preventing constipation, it can also contribute to gassiness, especially if the increase in fiber intake is sudden or not accompanied by adequate hydration. This is why gas is recognized as a common side effect of consuming a high fiber diet.